Improvement in metallic columns



l UNITED STATES PATENT CEEIOE JOsEPH L/OHAPMAN, OE PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN METALLI-C COLUMNS.

Specication forming part of Letters Patent No. 155,493, dated September 29, 1874; application filed September 4, 1874.

To all whom it may concern:

Be it known that I, J OsEPH L. CHAPMAN, of the city and county of Philadelphia and State of Pennsylvania, have invented a new and useful Improvement in Columns; and I do hereby declare the followingto be a clear and exact description of the nature thereof, sufficient to enable others skilled in the art to which my invention appertains to fully understand, make, and use the same, reference `being had to the accompanying drawings,

making part ot this specitication, in which- Figure l is a top or plan view of the device embodying my invention. Fig. 2 is a side elevation thereof. Figs. 3 and 4 are top views ot detached parts. o

Similar letters of reference indicate corresponding parts in the several igures.

This invention consists in forming a wroughtiron column of sections having dovetailed ends and locking-pieces, Which are constructed with dovetail channels, into which the ends Ot the sections are tted and locked, whereby, in building up thealiiisjtlie parts will not separate, the parts ot' the completed column will be firmly held together andnot spread,

fand various forms otl columns may bereadily tail-locking shape and adapted to receive the ends of the sections B B, as seen in Fig. l. The adjacent ends ot' two adjacent sections have a loclring-piece Q,slinpQCLQEEr said ends, andso On with all the other sections until the structure is"coniplete.

It will be seen that the ends of the sections abut against the cross-pieces b ot' the lockingpieces C, and the side pieces b overlap said ends of the sections so as to support them on both sides, whereby the sections will be firmly connected and braced at'their joints, both-inside and Outside.

It will also be perceived that columns may be variously formed by arranging the sections so that curves, bends, or angles may face in and out, as seen in Fig. 3, which, with the dotted lines, illustrates a portion of a manysided column.

I am aware that it is not new to construct the sections of a column with right-angular ends and the locking-pieces with right-angular channels 5 but such features do not lock the sections and pieces during the process Ot' building up thev column, nor prevent separation ofthe parts ot' the completed column, unless the locking-pieces are riveted to an inner ring or some other provision is made. I therefore lay no claim, broadly, to sections and locking-pieces; but

I claim as my invention, and as an improve ment in the art- The locking-pieces C, constructed of the side pieces b and connecting transverse pieces D, forming the dovetail channels b b, in colnbination with'the sections B, having dovetail ends c a, as herein set forth.

JOSEPH L. CHAPMAN.

Witnesses:

JOHN A. WIEDERSHEIM, A. P. GRANT. 

